Script I use to upgrade 3D Slicer on macOS using brew

slicerv.py

#!/usr/bin/env python3

"""
This script prints out the revision number and bitstream ID of the latest
nightly build of 3D Slicer.
"""

import re
import sys
from sys import platform as _platform
import urllib.request  # https://stackoverflow.com/a/22279013

from bs4 import BeautifulSoup  # https://stackoverflow.com/a/10974140

slicerURL = 'http://download.slicer.org'

## Get download URL
response = urllib.request.urlopen(slicerURL)
html = response.read()
parsed = BeautifulSoup(html, "html.parser")
o = parsed.findAll('a')

if _platform == "linux" or _platform == "linux2":  # linux
    button = o[6]
elif _platform == "darwin":  # MAC OS X
    button = o[5]
elif _platform == "win32":  # Windows
    button = o[4]

downloadURL = slicerURL + button.get('href')

buttonText = button.getText()
p = r'revision (\d+)'
revisionNumberString = re.findall(p, buttonText)[0]

n1 = revisionNumberString
n2 = downloadURL.split('/')[-1]

if len(sys.argv) == 2 and sys.argv[1] == '-cask':  # TODO: use argparse
    print(f'cask-repair --cask-version 4.11.0.{n1},{n2}'
          ' --fail-on-error --blind-submit slicer-nightly')
else:
    print(n1, n2)